also: ブッフェ · ビュフェ
noun
buffet; self-service meal
Refers to a style of meal where guests serve themselves from a variety of dishes, or the restaurant offering such a meal.
from French
ホテルの朝食はビュッフェ形式です。
The hotel breakfast is a buffet style.
あのレストランはランチビュッフェが人気だ。
That restaurant's lunch buffet is popular.
バイキング is a wasei-eigo term for a buffet, especially an all-you-can-eat style, while ビュッフェ is a direct loanword from French and often implies a more elegant or hotel-style self-service meal.
Loanword from French 'buffet', referring to a self-service meal or sideboard.